Black Heart: The Crimson Knot by TW Gallier
Price: $4.99 USD. 73750 words.
Published by Rowdy Rooster Publishing on May 12, 2013. .
Sable Hart patrols the night streets of Dallas, hunting for rogue vampires. She is the undead's self-appointed sheriff — called Black Heart in the paranormal community. When a rogue vampire goes on a killing spree and kills a woman tied to the wrong undead people, the boss of the local vampire mafia tasks her with finding him. Or he will kill her entire family.